New furnaces are up to 40 percent more energy-efficient than 20-year-old furnaces. That translates to less environmental impact and lower energy bills. An efficient furnace can pay for itself in just a few years; then you will start saving money. Below are shopping tips for buying a new energy- and cost-efficient furnace, and some good options.

Hillary Clinton did not have a State Department email account while she served as America's top diplomat, a senior state department official said Monday, and instead used a personal email account during her four years on the job.